Constant velocity joint and driveshaft including same

A driveshaft configured to transmit rotational driving force, comprising:

• an interconnecting shaft;
• and
• a constant velocity joint coupled to the interconnecting shaft,
• wherein the constant velocity joint comprises:
• an outer race forming a plurality of outer ball tracks;
• an inner race forming a plurality of inner ball tracks corresponding to the plurality of the outer ball tracks;
• a ball cage interposed between the outer race and the inner race and forming a plurality of windows;
• and
• a plurality of torque transmitting balls respectively disposed in spaces formed by the pairs of the outer and inner ball tracks in a state of being respectively housed in the windows,
• wherein the outer race and the inner race are configured to implement an angular articulation function that allows for relative angular displacement therebetween,
• wherein the inner race is coupled to the interconnecting shaft via a ball spline coupling structure to implement a length displacement function through relative axial displacement along an axial direction of the interconnecting shaft,
• wherein the ball spline coupling structure comprises:
• an outer spline groove provided on the inner race;
• an inner spline groove provided on the interconnecting shaft corresponding to the outer spline groove;
• a sleeve member interposed between the inner race and the interconnecting shaft;
• and
• a plurality of spline balls disposed in a space formed by a pair of the outer and inner spline grooves, with the spline balls being accommodated within a sleeve window formed on the sleeve member,
• wherein the outer race comprises an inner circumferential surface having a shape of a spherical surface with a first diameter,
• wherein a diagonal length of the inner race is smaller than the first diameter,
• wherein the ball cage comprises a first inclined surface provided on an inner circumferential surface of one end portion thereof,
• wherein the inner race comprises a second inclined surface provided on one end portion thereof, and
• wherein the first and second inclined surfaces are configured to contact each other when the ball cage and the inner race are angled relative to the outer race during an assembly of the torque transmitting ball.